WO1991005429A1 - Reseau interurbain a deplacement automatique sans commande centralisee - Google Patents

Reseau interurbain a deplacement automatique sans commande centralisee Download PDF

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Publication number
WO1991005429A1
WO1991005429A1 PCT/US1990/004783 US9004783W WO9105429A1 WO 1991005429 A1 WO1991005429 A1 WO 1991005429A1 US 9004783 W US9004783 W US 9004783W WO 9105429 A1 WO9105429 A1 WO 9105429A1
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WO
WIPO (PCT)
Prior art keywords
network
communication
trunked
communication unit
control
Prior art date
Application number
PCT/US1990/004783
Other languages
English (en)
Inventor
Sewim F. Ablay
Michael D. Sasuta
Richard H. Coe
Original Assignee
Motorola, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorola, Inc. filed Critical Motorola, Inc.
Publication of WO1991005429A1 publication Critical patent/WO1991005429A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/08—Trunked mobile radio systems

Definitions

  • This invention relates generally to trunked communications systems.
  • this invention relates to trunked communication systems (including cellular telephone systems and dispatch systems) that enable communication units to roam from one trunking system to another and is directed to a trunked communication network that support nationwide roaming.
  • Trunked communications systems are well known.
  • U.S. patent number 4,833,701 issued to Comroe et al., a trunked communication system with nationwide roaming capability is described but which requires a central hub computer communicating with each trunking system in the network to permit a communication unit away from its base system to communicate through new, foreign trunked communication systems.
  • a communication unit normally has one base trunked system.
  • a foreign trunked communication system shall be considered to be a ti uiMng system other than its base system.
  • a trunked communication system typically consists of a resource controller that allocates a limited number of communications resources (such as frequency pairs or TDM time slots) among a plurality of communication units.
  • a communication unit may be considered a mobile unit (typically installed in a vehicle), a portable unit, (typically carried on or about the person), or a control station, which is a trunked communication unit designed to be permanently or semi-permanently installed in a building or other fixed location.
  • Each communication unit in a trunked communication system has an identification code which, together with other information, is transmitted to the resource controller on a control resource to the resource controller when the communication unit desires access to a communications resource.
  • the resource controller Upon recognition of the identification code of the requesting unit on the control resource and the controllers granting of a communications resource, the resource controller directs other communication units associated with the requesting communication unit to monitor and communicate via a particular communications resource and permit the requesting communication unit and the receiving communication unit to communicate on that available resource.
  • a communication unit roaming from one trunked communication system to another must be able to find the control resource of the system, register with or identify itself to the resource controller of the new trunked communication system, and thereafter have the resource controller grant communication privileges to the visiting communication unit to permit the communication unit to communicate through the new trunking system.
  • the new trunking system verifies the validity of the visiting communication unit through a hub computer which interfaces to control computers of all the trunking systems making up the network of trunking systems before granting communication privileges to the roaming communication unit.
  • a problem with the trunked communication system as described by Comroe is that the hub computer is the only data link between the computers of several trunking systems.
  • the hub computer must continually communicate with the local computers of the associated trunking systems to update its data base to keep track of the location of roaming subscribers.
  • the host or hub computer of Comroe can become a bottleneck through which all of the data traffic for this nationwide trunking communication system must flow.
  • the network of trunked communication systems would be completely disabled, network of trunked communication system that avoids the data bottleneck of a single central hub computer and reduces the susceptibility of a complete system failure brought about by the failure of the hub would be an improvement over the prior art.
  • each of several control computers is associated with a trunking system.
  • the control computer for a trunking system tracks subscribers within its trunking system as well as foreign or visiting subscribers that are based in other trunking systems.
  • a visiting communication unit in a geographic coverage area of a foreign trunking system desiring communication through the foreign system first finds the control resource (the control channel in some systems) for the foreign trunking system and confirms that the new resource controller supports roaming subscribers.
  • the control resource the control channel in some systems
  • Trusted systems that support roaming could broadcast either a unique outbound signalling word, an identifier signal, an identifiable bit pattern in existing OSWs, or other signal from which a roaming communication unit could ascertain whether or not the new trunking system supports roaming.
  • a roaming communication unit finds a controller that supports roaming, the communication unit can thereafter attempt to log-on or register with the local computer of the new trunking system.
  • the roaming communication unit would typically send a request for service to the local controller of the new trunking system.
  • the requesting communication unit will identify itself and its base system to the new controller when the communication unit requests service from the new controller.
  • the controller of the new trunking system sends the identity of the communication unit, the request for service, along with other identification data of the roamer, to the controller of the base trunking system via a data network linking all the control computers of the network of trunking systems.
  • the controller of the base trunking system Upon receipt of the data from the controller of the new system, the controller of the base trunking system attempts to identify the roaming communication unit, its base system privileges and confirm its validity (to guard against unauthorized users). Upon verification of the identity of the roamer by the home system controller, the home system controller can download to the controller of the new system, the privileges granted to the roamer in the roamer's base system to the new controller. The controller for the new system may thereafter grant identical privileges to the roamer or greater or lesser privileges at the discretion of the operator of the remote system. (For example, the roaming communication unit may have telephone interconnect privileges in its base system while the new system might not have telephone interconnect capability. In such a case, granting telephone interconnect in the new system would be impossible.)
  • data or other information from the base trunking system can be communicated to the communication unit via the data network linking all the computers of the trunking systems together.
  • the controller for the roaming subscriber's base system will know where the roamer is located in the network and will know where to send user information, a message, or data destined for the communication unit.
  • An example of data exchange would be a text data message from the roaming subscriber's dispatcher (located within the base system) to the roaming communication unit in the new system.
  • the new communication unit in the foreign system can send data back to the controller for subsequent delivery elsewhere, perhaps to its dispatcher.
  • Voice communication with the communication unit may be permitted if the new system supports an interface to the local public switched telephone network. Direct contact with parties may occur via public switched telephone network (PSTN). If the data network linking the computers together had sufficient capacity (bandwidth, for example) voice communication between a roaming communication unit and its base system could occur over the data network. Alternate voice paths would include a microwave link between the foreign system and the base system for example.
  • PSTN public switched telephone network
  • a trunked communication system may not be coupled to a network of trunked communication systems.
  • communication privileges could still be granted to a roaming communication unit in an isolated foreign trunked communication system if the roaming communication unit has the capability of requesting the local controller for communication privileges. Instead of having a data transfer occur between local computers on the network, a similar data transfer occurs between the roaming communication unit and the local controller. After the controller receives the request from the communication unit, the controller grants privileges commensurate with set of privileges allowed roaming communication units.
  • Figure 1 is a block diagram of the networked trunked communication system supporting automatic roaming without a central controller.
  • Each trunking system (A, B, and C) making up the network includes a central controller (102A-C), a local computer (106A-C), repeaters (104A-C), and public switched telephone network interface units (108A-C).
  • the controllers (102A-C) operate under the control of local computers (106A-C) and allocate operating resources of the repeaters (104A-C) within the trunking systems (A, B, and C).
  • the local computers (106A-C) in each of the three trunking systems perform several administrative functions including allocating and assigning ID codes to subscribers in the coverage area of the trunking systems (A, B and C), decoding ID codes sent in from communication unit, and reprogramming roaming communication unit (112) so that the roaming units may operate within the particular system controlled by the local computer (106).
  • the local computers (106A-C) are also directly coupled to each other, forming a network of such computers, through data networks (10, 12, and 14) which are described below in greater detail.
  • the local computers (106A-C) are coupled to the PSTN through local PSTN interfaces (108A-C) so that subscribers (112) in communication with any of the central computers (102) could make telephone interconnected calls through the repeaters (104A-C) the local computers (106A-C), and through the local PSTN interface (108A-C) (Assuming of course that telephone interconnect privileges are granted to the communication unit; the technical description of the telephone interconnect feature is well know in trunked communications systems and will not be described further.)
  • trunked communication systems (100) could support call forwarding.
  • a communication unit with telephone interconnect privileges in system A may be reached anywhere in the network (100) via telephone when a party wishing to contact the communication unit (112) dials the telephone number for the communication unit when the communication unit is present in system A. If the communication unit (112) is out of the geographic coverage area of its base system (A), telephone interconnect is ordinarily not possible.
  • the foreign system can assign telephone interconnect privileges to the communication unit (112) while it resides in the foreign system (system B) and can forward to the local computer of the base system (system A), the new phone number of the PSTN interface in system B.
  • the local computer for system A can thereafter forward incoming calls to the communication unit (112) to the new systems PSTN interface, perhaps dialing the new number of the new PSTN interface for the caller such that the call forwarding is transparent to the caller.
  • the principal feature of this invention is improved communications between the different trunking systems by networked local computers; from this improvement flow other improvements.
  • the network of trunking systems supporting automatic roaming (100) is improved by directly coupling the local computers (106) of one trunking system (A, for example) to the local computers (106B-C) of other trunking systems (B and C).
  • each local computer (106) is coupled to every other local computer comprising the network (100), improving data handling between computers and increasing the networks reliability.
  • the local computers (106A-C) are coupled together via commercial data services that provide the physical links between the computers as well as define the protocol used by the computers. (Private, hard-wired connections between the computers may be preferred in some circumstances.)
  • the local computer of system A (106A) is typically coupled to the local computer of system B or C by leased data lines (10 and 14). These data lines could include packet switch data networks (PSDN).
  • PSDN packet switch data networks
  • the local computer for system C communicates with the local computers for systems A and B by similar data networks (10 and 12) as does the local computer of system B communicate with the local computer of system A and C over data networks 14 and 12.
  • the physical networks coupling these computers together could be any combination of appropriate networks including a microwave based data link, a satellite based data link, leased telephone lines; or network of leased data lines.
  • the physical links between local computers (106A-C) could also be arranged in other orientations. (Instead of the nearly parallel connection of local computers as depicted in figure 1, the links between several local computers could also be an electrical in-series connection.
  • One local computer might receive data from another, decode the data and send it on to the next local computer in a linear string of local computers. Such an arrangement might suffer the same drawbacks as Comroe, however, with one computer at or near the center of the network handling virtually all the roaming-related data.)
  • the data transfer on the physical links could be by way of any appropriate protocol. For example, an X.25 : rotocol, well known in the art, could be used on the networks.
  • each local computer (106A-C) will typically assign a roaming ID to a communication unit (112) that is visiting its system that is based in another system. This information would typically be retained locally in the local data base (107).
  • the local computers can assign unique identification codes (ID's) to the roaming subscribers when they are granted privileges and can de- assign ID's when the subscribers leave or are inactive. The status of these ID's would ordinarily be kept in the local data bases (107A- C). These ID's could also be used to identify the privileges granted the roamer.
  • ID's unique identification codes
  • a local computer will typically include means for periodically polling the status of visiting subscribers to establish whether or not these subscribers are considered to be active within the trunking system.
  • the local computers are programmed to periodically contact visiting subscribers based upon the contents of a table of assigned roaming ID's and look for a response from the visiting subscribers by the data resource broadcast from the local computer. If no response is detected by the central computer from the visiting communication unit after some predetermined time limit and number of re-tries, the local computer might consider the visiting communication unit to have either left the trunking system or be out of service in which case, the local computer may mark the visiting communication unit as vacant, return the ID code of the visiting communication unit to a table of available ID codes, and mark the visiting communication unit as no longer resident within its trunking system coverage area. In the event the roaming communication unit is temporarily out of service, the local computer might employ multiple time-outs, the expiration of which might be required before marking the roamer as absent.
  • each roaming communication unit includes the capability of scanning for control resources (control channels in some systems) and identifies the control resources from local computers that support roaming trunking communication protocol.
  • control resources control channels in some systems
  • roaming subscribers would typically scan a set of radio frequencies designated as control resource frequencies for trunking communications systems.
  • the communication unit might have to employ different algorithms to identify an optimum control resource to lock onto. (The communication unit of course would have to have radio transmission and reception capabilities compatible with the various trunking systems comprising the network (100).
  • the communication unit must detect whether or not the local computer supports roaming communications by decoding data on the control resource.
  • the communication unit radio (112) must logon and identify itself to the local computer (106B) of the roaming trunking system (B).
  • the radio might send its group number, if any, and ID number, if any. (As well as any password used by the network (100)) to the local computer of the foreign trunking system (B) and request from the trunking system local computer (106B) a roaming ID which the radio and the trunking local computer would thereafter use to identify this communication unit.
  • the local computer of the new system Upon receipt of the data from the communication unit (112) (a part of which identifies the base system of the roamer to the new local computer), the local computer of the new system (106B) can thereafter proceed to contact the local computer (106A) for the roaming subscriber's base system (A) via an appropriate data path (through 14 directly or possibly through 12 then 14 as described above).
  • the base computer can use the data sent from the foreign local computer to identify the roamer based upon data in its own data base (107A) and down-load to the foreign local computer the operating privileges granted to the roamer in its base system.
  • communication of the communication unit (112) in a foreign trunking system i.e., the trunking system
  • the trunking system is primarily intended to be a data communication.
  • a dispatch terminal (113) within the base trunking system (A) desiring to communicate with the communication unit (112) in a foreign trunking system may pass a data message, either a packet type message or free-format text, to the communication unit (112) via the data networks between the local computers (10, 12, 14).
  • the dispatch terminal (113) is coupled to the local computer (106A) through a data link (114) similar to the other data links (10,12, 14). Since the communication unit (112) is out of communications range of the local computer of its base station, direct voice communication between the communication unit (112) and the dispatcher at the dispatch terminal (113) would therefore be impossible via the base trunking network. Alternatively, voice communication between the dispatcher (113) in the base trunking system (A) could take place via the existing telephone communication network.
  • a dispatcher (113) desiring to communicate over a voice resource with a communication unit could place or receive a call to the communication unit using an interface to the Public Switch Telephone Network existing in the foreign trunking system (System B as shown in figure 1).
  • the communication unit could either place or receive telephone calls through the foreign trunking system (System B) and its interface to the Public Switch Telephone Network system (108B) thereby permitting voice communications with the dispatcher in the base trunking system (System A).
  • An alternate embodiment of the invention would include isolated trunked communication systems (i.e. systems not coupled to a network of local control computers but having at least one local control computer), granting communication privileges to a roaming communication unit (112).
  • the roaming communication unit (112) that finds a control resource for an isolated system that supports roaming communication units could grant communication privileges after the unit (112) requests the local computer of the isolated system to grant it communication privileges commensurate with privileges allowed the unit in its base system. (Alternatively, the local computer of the isolated system to grant privileges to the roaming communication unit greater than the privileges granted to the unit by its base system.)
  • the controller for the isolated system would inform the communication unit of all its necessary parameters with the exception of possibly one parameter, the units' serial number. If the roaming communication unit could not successfully perform this initialization on the system, or if the unit received a reject of its attempted logon, the communication unit would begin looking for the control resource of another system upon which to attempt initialization.
  • a trunked system supporting roaming but not coupled to a network can be seen in figure 1 by presuming that the data networks linking the computers (10, 12 and 14) do not exist, are disabled, or, do not carry data between local computers.
  • the roaming unit would have to upload the operating privileges to the local computer which would grant communication privileges to the unit (112) based upon the data sent to the local computer from the communication unit.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Un réseau (100) de systèmes de communication interurbain (A, B et C) assure la communication avec une unité de communication (112) se déplaçant dans la zone géographique couverte par ledit réseau, en faisant communiquer directement des ordinateurs de commande (106) les uns avec les autres, associés aux systèmes interurbains individuels, transférant des informations relatives à l'unité de communication se déplaçant, entre eux. L'identification et les privilèges de l'unité de communication en déplacement (112) sont passés dans le réseau (100) par les ordinateurs (106) donnant à l'unité de communication en déplacement la capacité d'échanger des données dans le réseau directement, ou, par l'intermédiaire d'interconnexions téléphoniques se trouvant dans les divers systèmes interurbains, afin de communiquer via un message vocal par l'intermédiaire du réseau téléphonique (108A, 108B, 108C) à commutation public.
PCT/US1990/004783 1989-09-29 1990-08-24 Reseau interurbain a deplacement automatique sans commande centralisee WO1991005429A1 (fr)

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US41485589A 1989-09-29 1989-09-29
US414,855 1989-09-29

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0553277A1 (fr) * 1990-10-16 1993-08-04 Motorola, Inc. Systeme de telecommunications radiomobile avec reseau numerique a integration de services
US5255307A (en) * 1992-05-07 1993-10-19 Sony Electronics Inc. Status indicator control for cellular mobile telephone system
EP0579305A2 (fr) * 1992-07-02 1994-01-19 Philips Electronics Uk Limited Solution des conflits entre systèmes de communication
WO1994001978A1 (fr) * 1992-07-10 1994-01-20 Neil Alexander Rimer Systeme permettant de localiser et de communiquer avec des vehicules mobiles
US5392458A (en) * 1990-09-20 1995-02-21 Motorola, Inc. Trunked communication system with variable communication capability support for roamers
EP0883316A1 (fr) * 1997-06-06 1998-12-09 Lucent Technologies Inc. Réseau et procédé de provision de services locaux à un téléphone sans fils servi par un autre réseau
EP1282322A2 (fr) * 2001-08-01 2003-02-05 Motorola, Inc. Systèmes de communication et stations mobiles et installations associés
WO2006002576A1 (fr) * 2004-07-06 2006-01-12 Zte Corporation Reseau numerique de communications a ressources partagees prenant en charge l'itinerance, et procede associe
WO2006029390A2 (fr) * 2004-09-09 2006-03-16 Nextel Communications, Inc. Systeme et procede facilitant l'itinerance des abonnes de messagerie vocale sur des reseaux de repartition disparates
WO2007019730A1 (fr) 2005-08-18 2007-02-22 Zte Corporation Méthode d’implémentation de nomadisme pour système de communication numérique trunk
CN100446591C (zh) * 2003-12-29 2008-12-24 中兴通讯股份有限公司 一种支持漫游的数字集群通信网络及其漫游方法
US9551582B2 (en) 1998-01-27 2017-01-24 Blanding Hovenweep, Llc Mobile communication device

Families Citing this family (1)

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SE500197C2 (sv) * 1992-08-18 1994-05-02 Ericsson Telefon Ab L M Kommunikationsnät, förfarande att åstadkomma en förbindelse samt registreringsförfarande i ett sådant nät

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US4887265A (en) * 1988-03-18 1989-12-12 Motorola, Inc. Packet-switched cellular telephone system
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US4112257A (en) * 1977-03-24 1978-09-05 Frost Edward G Comprehensive automatic mobile radio telephone system
US4670905A (en) * 1985-11-29 1987-06-02 Motorola, Inc. Method and apparatus for coordinating independent communications systems
US4775999A (en) * 1986-10-31 1988-10-04 Motorola, Inc. Registration of radiotelephones in networked cellular radiotelephone systems
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US4901340A (en) * 1988-09-19 1990-02-13 Gte Mobilnet Incorporated System for the extended provision of cellular mobile radiotelephone service

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5392458A (en) * 1990-09-20 1995-02-21 Motorola, Inc. Trunked communication system with variable communication capability support for roamers
EP0553277A4 (fr) * 1990-10-16 1994-03-23 Motorola, Inc.
EP0553277A1 (fr) * 1990-10-16 1993-08-04 Motorola, Inc. Systeme de telecommunications radiomobile avec reseau numerique a integration de services
US5255307A (en) * 1992-05-07 1993-10-19 Sony Electronics Inc. Status indicator control for cellular mobile telephone system
EP0579305A2 (fr) * 1992-07-02 1994-01-19 Philips Electronics Uk Limited Solution des conflits entre systèmes de communication
EP0579305B1 (fr) * 1992-07-02 2001-09-26 Philips Electronics Uk Limited Solution des conflits entre systèmes de communication
WO1994001978A1 (fr) * 1992-07-10 1994-01-20 Neil Alexander Rimer Systeme permettant de localiser et de communiquer avec des vehicules mobiles
US5432841A (en) * 1992-07-10 1995-07-11 Rimer; Neil A. System for locating and communicating with mobile vehicles
EP0883316A1 (fr) * 1997-06-06 1998-12-09 Lucent Technologies Inc. Réseau et procédé de provision de services locaux à un téléphone sans fils servi par un autre réseau
US5999521A (en) * 1997-06-06 1999-12-07 Lucent Technologies Inc. System and method for providing local services to a wireless telephone served by another system
US9551582B2 (en) 1998-01-27 2017-01-24 Blanding Hovenweep, Llc Mobile communication device
US10127816B2 (en) 1998-01-27 2018-11-13 Blanding Hovenweep, Llc Detection and alert of automobile braking event
EP1282322A2 (fr) * 2001-08-01 2003-02-05 Motorola, Inc. Systèmes de communication et stations mobiles et installations associés
EP1282322A3 (fr) * 2001-08-01 2003-08-20 Motorola, Inc. Systèmes de communication et stations mobiles et installations associés
CN100446591C (zh) * 2003-12-29 2008-12-24 中兴通讯股份有限公司 一种支持漫游的数字集群通信网络及其漫游方法
US7778215B2 (en) 2004-07-06 2010-08-17 Zte Corporation Digital trunked communication network which supports roaming and method thereof
WO2006002576A1 (fr) * 2004-07-06 2006-01-12 Zte Corporation Reseau numerique de communications a ressources partagees prenant en charge l'itinerance, et procede associe
WO2006029390A2 (fr) * 2004-09-09 2006-03-16 Nextel Communications, Inc. Systeme et procede facilitant l'itinerance des abonnes de messagerie vocale sur des reseaux de repartition disparates
WO2006029390A3 (fr) * 2004-09-09 2009-04-09 Nextel Communications Systeme et procede facilitant l'itinerance des abonnes de messagerie vocale sur des reseaux de repartition disparates
WO2007019730A1 (fr) 2005-08-18 2007-02-22 Zte Corporation Méthode d’implémentation de nomadisme pour système de communication numérique trunk

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CN1050964A (zh) 1991-04-24
AU6277790A (en) 1991-04-28

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